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<br />,. <br /> <br />AREA STODIED <br /> <br />This report covers an area along the Cache La Poudre River within <br />the City of Fort Collins and in adjacent areas of Larimer County. '!he <br />study area began at Horsetooth Road downstream of Fort Collins and <br />extended upstream through the City to the south end of Watson Lake. <br />The study reach has a stream distance of approximately 13.8 miles. <br />The area of the study is shown in Figure 1. <br /> <br />Source of Data <br />Orthophotographic mapping with two-foot contour intervals at a <br />scale of one inch to tWo hundred feet was provided by the Ci ty. HEC-2 <br />models of the Cache La Poudre River through the study area were <br />available from the Corps' 1989 Special Flood Hazard (SFH) study <br />(Reference 1) on the Cache La Poudre River at Fort Collins. The HEC-2 <br />models were originally developed by a consulting firm working under <br />contract to the Federal Emergency Management Agency and were provided <br />by the City of FOrt Collins, along with work maps showing the cross <br />section locations. Additional information on the stream bed <br />elevations in the vicinity of diversion structures was provided by the <br />City in June 1992. <br /> <br />m;INEERING METHODS <br /> <br />Floods having a recurrence interval of 10-, 50-, 100-, and 500- <br />years have significance for flood plain management. Because of this, <br />these floods were designated for study. <br /> <br />2 <br /> <br />~. <br />